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Simplifying 6a + -3 = -21 + 4a Reorder the terms: -3 + 6a = -21 + 4a Solving -3 + 6a = -21 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. -3 + 6a + -4a = -21 + 4a + -4a Combine like terms: 6a + -4a = 2a -3 + 2a = -21 + 4a + -4a Combine like terms: 4a + -4a = 0 -3 + 2a = -21 + 0 -3 + 2a = -21 Add '3' to each side of the equation. -3 + 3 + 2a = -21 + 3 Combine like terms: -3 + 3 = 0 0 + 2a = -21 + 3 2a = -21 + 3 Combine like terms: -21 + 3 = -18 2a = -18 Divide each side by '2'. a = -9 Simplifying a = -9
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